CR

Anolis ernestwilliamsi

Unknown

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Anolis ernestwilliamsi faces severe threats from habitat destruction due to urban development and agricultural expansion across its extremely limited range in Puerto Rico. The species is particularly vulnerable to introduced predators and competitors, including cats and other non-native anole species that disrupt its ecological niche. Climate change poses an additional threat through altered precipitation patterns and increased hurricane intensity, which can devastate the small remaining populations of this critically endangered lizard.

Threat summary

Habitat

This critically endangered anole inhabits dry coastal forests and scrublands in southwestern Puerto Rico, particularly favoring areas with dense vegetation cover and rocky outcrops. The species requires specific microhabitat conditions including adequate canopy cover and suitable perching sites for territorial behavior and foraging.

Shrubland· majorMarine neritic· major

Conservation measures underway

Site/area protectionSpecies recovery

Frequently asked questions

Why is Anolis ernestwilliamsi classified as Critically Endangered?
Anolis ernestwilliamsi is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Anolis ernestwilliamsi faces severe threats from habitat destruction due to urban development and agricultural expansion across its extremely limited range in Puerto Rico. The species is particularly vulnerable to introduced predators and competitors, including cats and other non-native anole species that disrupt its ecological niche. Climate change poses an additional threat through altered precipitation patterns and increased hurricane intensity, which can devastate the small remaining populations of this critically endangered lizard.
Where does Anolis ernestwilliamsi live?
Anolis ernestwilliamsi occurs in British Virgin Islands, and U.S. Virgin Islands. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Anolis ernestwilliamsi?
The main threats to Anolis ernestwilliamsi are 10.2, 11.1, 12.1, and 8.3. The full IUCN-classified threat record for this species is detailed on the species page.

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